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Lower alloy steel laser-electric arc hybrid welding method

A low-alloy steel and composite welding technology, which is applied in laser welding equipment, welding equipment, metal processing, etc., to achieve the effects of improving weld formation and welding quality, large penetration depth, and reducing environmental pollution

Inactive Publication Date: 2014-01-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The development and application of laser-arc hybrid welding technology in my country is still in its infancy

Method used

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  • Lower alloy steel laser-electric arc hybrid welding method
  • Lower alloy steel laser-electric arc hybrid welding method

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1. Laser-arc hybrid welding of Q355NH low-alloy steel plate is carried out by adopting the method of the present invention, and the thickness of Q355NH steel plate is 10mm. The joint form is Y-shaped groove butt joint, groove angle θ=32°, blunt edge height h=5mm; composite welding adopts H10MnSiCuNiⅡ welding wire (Φ1.2mm) and two-layer two-pass welding process; welding parameters of the first weld seam : Laser power 5kW, welding current 230A, welding speed 1.2m / min, welding parameters of the second weld: laser power 2kW, welding current 230A, welding speed 0.7m / min; 80%Ar+20% is used in the welding process CO 2 Gas protection, gas flow rate 20L / min. The weld seam of laser-arc hybrid welding is well formed, and there are no welding defects such as cracks, pores, undercuts, incomplete penetration, and incomplete fusion; the average tensile strength, yield strength, elongation, and impact energy of the joints are 558.6MPa and 409.1 .6MPa, 22.8%, 70J (-20°C), t...

Embodiment 2

[0032] Embodiment 2. Using the method of the present invention to carry out laser-arc hybrid welding of S355J2W weather-resistant steel plate, the thickness of the S355J2W steel plate is 12mm. The joint form is a Y-shaped groove butt joint, the groove angle θ=30°, and the height of the blunt edge h=6mm; NiCu1-IG welding wire (Φ1.2mm) and two-layer two-pass welding process; welding parameters of the first weld: laser power 6kW, welding current 230A, welding speed 1.2m / min, welding parameters of the second weld: The laser power is 2kW, the welding current is 240A, and the welding speed is 0.6m / min; the welding process is protected by argon (Ar), and the argon flow rate is 16L / min. The weld seam of laser-arc hybrid welding is well formed, and there are no welding defects such as cracks, pores, undercuts, incomplete penetration, and incomplete fusion; the average tensile strength, yield strength, elongation, and impact energy of the joints are 540.0MPa and 389.1 MPa, 23.5%, 78J ...

Embodiment 3

[0033] Embodiment 3, adopt the method of the present invention to carry out laser-arc hybrid welding of Q355NH low-alloy steel plate, the thickness of Q355NH steel plate is 16mm. The joint form is Y-shaped groove butt joint, groove angle θ=30°, blunt edge height h=7mm; H10MnSiCuNiⅡ welding wire (Φ1.2mm) and three-layer three-layer welding process are used; welding parameters of the first weld seam : Laser power 6kW, welding current 240A, welding speed 1.2m / min, welding parameters of the second weld: laser power 2kW, welding current 270A, welding speed 0.4m / min, welding parameters of the third weld: laser Power 2kW, welding current 290A, welding speed 0.4m / min; 85%Ar+15%CO is used in the welding process 2 Gas shielding, the shielding gas flow rate is 18L / min. The weld seam of laser-arc hybrid welding is well formed, without welding defects such as cracks, pores, undercuts, incomplete penetration, and incomplete fusion; the average tensile strength, yield strength, elongation, ...

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Abstract

The invention relates to a lower alloy steel laser-electric arc hybrid welding method in the technical field of metallurgy, machinery, ships, automobiles, pipelines, petrochemical industry, marine equipment, pressure vessels, war industry and the like. In order to solve the problems existing in a traditional welding method, on the basis of the effect law of laser-electric arc coupling characteristics and laser-electric arc hybrid welding parameters, the welding parameters and the groove sizes of all welding joints of multilayer welding are optimized with the orthogonal design test method, and the researched and developed lower alloy steel laser-electric arc hybrid welding method has the advantages of being small in heat input amount, large in fusion depth, small in deformation and high in welding speed, capable of reducing the area of the welding joints, the width of the heat affected zone and the exhaust amount of harmful gas and smoke and favorable for improving welding quality and welding efficiency, lowering production cost, improving the quality of products and relieving environmental pollution. The method includes the processing steps that welding grooves are machined, the optimized welding parameters are adopted for all the welding joints of the multilayer welding, and lower alloy steel laser-electric arc hybrid welding is performed.

Description

technical field [0001] The invention relates to a low-alloy steel laser-arc hybrid welding technology in the technical fields of metallurgy, machinery, ships, automobiles, pipelines, petrochemical industry, marine equipment, pressure vessels and military industry, and belongs to the technical field of material welding (connection). Background technique [0002] Low alloy steel has the characteristics of high strength, high toughness and good comprehensive performance, and has been widely used in the industrial field. As we all know, the wide application of any metal structural material not only depends on its own performance characteristics, but also depends on the progress of welding (connecting) technology. At present, traditional welding methods such as submerged arc welding and gas shielded arc welding are mainly used for welding low alloy steel (especially welding of medium and thick plates). Large deformation, joint embrittlement, easy to produce defects and low weldi...

Claims

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Application Information

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IPC IPC(8): B23K28/02
CPCB23K26/348B23K33/00B23K2101/185
Inventor 孙大千谷晓燕李洪梅
Owner JILIN UNIV
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